Update : warm morning (around -1°C) but lot of snow... c°WT showed ?? forgot to check. EBH plugged for 3 hours 20 minutes. SG said 5.8 LHK so around ~6.6 LHK in reality.
On the returning trip, temp was -4°C outside, c°WT showed 1°C. I had to use lights, I didn't use heat. SG said 5.5 LHK so around ~6.4 LHK in reality. I used DWL instead of P&G on the highway and definitely got better results than P&G even in better conditions. Hit ~258 Km today and tank is little bit under the 3/4.
Tomorrow will be another warmer morning but with some snow and wind.